| // Copyright Daniel Wallin, David Abrahams 2010. Use, modification and | |
| // distribution is subject to the Boost Software License, Version 1.0. (See | |
| // accompanying file LICENSE_1_0.txt or copy at | |
| // http://www.boost.org/LICENSE_1_0.txt) | |
| #ifndef BOOST_PARAMETER_IS_MAYBE_050329_HPP | |
| #define BOOST_PARAMETER_IS_MAYBE_050329_HPP | |
| #include <boost/type_traits/is_base_and_derived.hpp> | |
| namespace boost { | |
| namespace parameter { | |
| namespace aux { | |
| struct maybe_base {}; | |
| template <class T> | |
| struct is_maybe | |
| : is_base_and_derived<maybe_base, T> | |
| {}; | |
| } // namespace aux | |
| } // namespace parameter | |
| } // namespace boost | |
| #endif // BOOST_PARAMETER_IS_MAYBE_050329_HPP |